Permeable experiments on complete stress-strain course of limestone and sandstone were carried out in servo-controlled testing machine. The relation between axial strain and permeability of rock specimen during the course of deformation and failure is made by a detailed investigation. The effect law of lateral strain on the permeability of rock specimen is analyzed. At the same time

the variance relation of permeable pressure head with time before and after the deformation and failure of rock specimen is also discussed. The result shows that the permeability of rock specimen is closely related with the stress state; and the peak value of permeability comes out nearby the peak value of stress-strain

which has a close relation with the property of rock material. There are the same variance tendency between permeability-lateral strain curve and permeability-axial strain curve. However

the lateral deformation of rock can reflect more sensitively the evolution law of permeability than the axial deformation. The permeable pressure head complies with negative exponential relation with time during the course of deformation and failure of rock specimen. In the end

the permeable mechanism is made with a detailed discussion during the course of deformation and failure of rock specimen.